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/* $Id: DisasmMisc.cpp $ */
/** @file
* VBox disassembler- Misc Helpers.
*/
/*
* Copyright (C) 2006-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_DIS
#include <VBox/dis.h>
#include <VBox/disopcode.h>
#include <iprt/errcore.h>
#include <VBox/log.h>
#include <VBox/vmm/cpum.h>
#include <iprt/assert.h>
#include <iprt/string.h>
#include <iprt/stdarg.h>
#include "DisasmInternal.h"
DISDECL(uint8_t) DISGetParamSize(PCDISSTATE pDis, PCDISOPPARAM pParam)
{
unsigned subtype = OP_PARM_VSUBTYPE(pParam->fParam);
switch (subtype)
{
case OP_PARM_v:
switch (pDis->uOpMode)
{
case DISCPUMODE_32BIT:
return 4;
case DISCPUMODE_64BIT:
return 8;
case DISCPUMODE_16BIT:
return 2;
default: AssertFailed(); /* make gcc happy */ return 4;
}
break;
case OP_PARM_b:
return 1;
case OP_PARM_w:
return 2;
case OP_PARM_d:
return 4;
case OP_PARM_q:
return 8;
case OP_PARM_dq:
return 16;
case OP_PARM_qq:
return 32;
case 0: /* nop, pause, lea, wrmsr, rdmsr, etc. Most of these due to DISOPPARAM::cb being initialized in the wrong place
(disParseInstruction) where it will be called on intermediate stuff like IDX_ParseTwoByteEsc. The parameter
parsers should do it instead, though I see the potential filtering issue. */
//Assert( pDis->pCurInstr
// && ( pDis->pCurInstr->uOpcode == OP_NOP
// || pDis->pCurInstr->uOpcode == OP_LEA ));
return 0;
case OP_PARM_p: /* far pointer */
if (pDis->uAddrMode == DISCPUMODE_32BIT)
return 6; /* 16:32 */
if (pDis->uAddrMode == DISCPUMODE_64BIT)
return 12; /* 16:64 */
return 4; /* 16:16 */
case OP_PARM_s: /* lgdt, sgdt, lidt, sidt */
return pDis->uCpuMode == DISCPUMODE_64BIT ? 2 + 8 : 2 + 4;
case OP_PARM_a:
return pDis->uOpMode == DISCPUMODE_16BIT ? 2 + 2 : 4 + 4;
case OP_PARM_pi:
return 8;
case OP_PARM_sd:
case OP_PARM_ss:
return 16;
case OP_PARM_x:
case OP_PARM_pd:
case OP_PARM_ps:
return VEXREG_IS256B(pDis->bVexDestReg) ? 32 : 16; //??
case OP_PARM_y:
return pDis->uOpMode == DISCPUMODE_64BIT ? 4 : 8; //??
case OP_PARM_z:
if (pParam->cb)
return pParam->cb;
return pDis->uOpMode == DISCPUMODE_16BIT ? 2 : 4; //??
default:
if (pParam->cb)
return pParam->cb;
/// @todo dangerous!!!
AssertMsgFailed(("subtype=%#x fParam=%#x fUse=%#RX64 op=%#x\n", subtype, pParam->fParam, pParam->fUse,
pDis->pCurInstr ? pDis->pCurInstr->uOpcode : 0));
return 4;
}
}
#if 0 /* currently unused */
DISDECL(DISSELREG) DISDetectSegReg(PCDISSTATE pDis, PCDISOPPARAM pParam)
{
if (pDis->fPrefix & DISPREFIX_SEG)
/* Use specified SEG: prefix. */
return (DISSELREG)pDis->idxSegPrefix;
/* Guess segment register by parameter type. */
if (pParam->fUse & (DISUSE_REG_GEN32|DISUSE_REG_GEN64|DISUSE_REG_GEN16))
{
AssertCompile(DISGREG_ESP == DISGREG_RSP);
AssertCompile(DISGREG_EBP == DISGREG_RBP);
AssertCompile(DISGREG_ESP == DISGREG_SP);
AssertCompile(DISGREG_EBP == DISGREG_BP);
if (pParam->Base.idxGenReg == DISGREG_ESP || pParam->Base.idxGenReg == DISGREG_EBP)
return DISSELREG_SS;
}
/* Default is use DS: for data access. */
return DISSELREG_DS;
}
DISDECL(uint8_t) DISQuerySegPrefixByte(PCDISSTATE pDis)
{
Assert(pDis->fPrefix & DISPREFIX_SEG);
switch (pDis->idxSegPrefix)
{
case DISSELREG_ES:
return 0x26;
case DISSELREG_CS:
return 0x2E;
case DISSELREG_SS:
return 0x36;
case DISSELREG_DS:
return 0x3E;
case DISSELREG_FS:
return 0x64;
case DISSELREG_GS:
return 0x65;
default:
AssertFailed();
return 0;
}
}
#endif
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